x^2+6x=520
    x2+6x=52
    x+x/11.3=78835-800
    x+x/11.3=78835
    x+x/11.3=83535-4700
    3-(2x-1)÷3=(4-3x)÷5-x
    e^x = x^2
    285.8x+890.3(3-x)=2066.4
    5x+7=12
    100x^2+5202x-25721=0
    （z^3z^-5）^2
    2x∧3＋3x∧2－12x＋7＝0
    sqrt((4-x)^2+(-3/4x+3)^2)
    sqrt((4-x)^2+(-3/4x+3)^2)
    2x+(3x-5)=15
    x+2=6
    5t²-12t+2=0
    6×X＝3.79
    X^2-20.5x- 90.5=0
     （350-x）*（30+x/5) = 12000

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